/* =============================================================
   PAST PAPERS PREMIUM — Vanilla JS UI
   Companion to /content/scripts/past-papers-app.js
   ============================================================= */

/* ── Design tokens — sourced from mainstyles.css variables ──── */
:root {
  /* Surfaces — map to mainstyles neutrals */
  --pp-bg:        var(--background-alt);
  --pp-surface:   var(--background);
  --pp-surface-2: var(--background-dark);
  --pp-surface-3: var(--border-color);

  /* Borders */
  --pp-border:        var(--border-color);
  --pp-border-strong: #d1d5db;

  /* Text */
  --pp-text:   var(--text-dark);
  --pp-text-2: var(--text-light);
  --pp-text-3: var(--text-secondary);
  --pp-text-4: var(--text-faint);

  /* Accent — site primary red */
  --pp-accent:     var(--primary-color);
  --pp-accent-2:   var(--primary-dark);
  --pp-accent-dim: rgba(232,17,35,.10);
  --pp-on-accent:  #ffffff;

  /* Status */
  --pp-success:     var(--secondary-color);
  --pp-success-dim: rgba(16,185,129,.13);
  --pp-warn:        var(--accent-orange);
  --pp-warn-dim:    rgba(245,158,11,.12);

  /* Shape */
  --pp-radius:    var(--radius-lg);
  --pp-radius-sm: var(--radius-md);
  --pp-radius-xs: var(--radius-sm);

  /* Motion — no equivalents in mainstyles, kept as pp tokens */
  --pp-ease:        cubic-bezier(0.23,1,0.32,1);
  --pp-ease-drawer: cubic-bezier(0.32,0.72,0,1);
  --pp-fast:  130ms var(--pp-ease);
  --pp-base:  200ms var(--pp-ease);

  /* Shadow */
  --pp-shadow-sm: var(--shadow-sm);
  --pp-shadow-md: var(--shadow-md);
  --pp-shadow-lg: var(--shadow-lg);

  /* Layout */
  --pp-rail-w: 272px;
  --pp-row-h:  62px;
}

/* ── Dark mode: only override values not covered by mainstyles ─ */
/* mainstyles.css already re-maps --primary-color, --background,  */
/* --border-color etc. on [data-theme="dark"] so --pp-* tokens    */
/* that point to those variables inherit dark mode automatically.  */
/* Only the alpha/dim values and border-strong need explicit work. */
:root[data-theme="dark"] {
  --pp-accent-dim:    rgba(248,113,113,.14);
  --pp-on-accent:     #1a0000;
  --pp-success-dim:   rgba(52,211,153,.15);
  --pp-warn-dim:      rgba(251,191,36,.13);
  --pp-border-strong: #4b5563;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --pp-accent-dim:    rgba(248,113,113,.14);
    --pp-on-accent:     #1a0000;
    --pp-success-dim:   rgba(52,211,153,.15);
    --pp-warn-dim:      rgba(251,191,36,.13);
    --pp-border-strong: #4b5563;
  }
}

/* ── Base reset for pp scope ───────────────────────────────── */
.pp-root *,
.pp-root *::before,
.pp-root *::after { box-sizing: border-box; }

.pp-root {
  font-family: "Lexend", system-ui, -apple-system, sans-serif;
  color: var(--pp-text);
  background: var(--pp-bg);
  min-height: 60vh;
}

.pp-root button { cursor: pointer; font-family: inherit; }
.pp-root input,
.pp-root select { font-family: inherit; }

.pp-svg-icon {
  display: inline-block;
  vertical-align: middle;
  flex-shrink: 0;
  line-height: 1;
}

/* ── Page header strip ─────────────────────────────────────── */
.pp-header {
  background: var(--pp-surface);
  border-bottom: 1px solid var(--pp-border);
  padding: 20px 24px 18px;
}

.pp-header-inner {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}

.pp-header-title {
  margin: 0 0 4px;
  font-size: 1.625rem;
  font-weight: 700;
  letter-spacing: -.025em;
  color: var(--pp-accent);
}

.pp-header-meta {
  font-size: 0.8125rem;
  color: var(--pp-text-3);
  margin: 0;
}

.pp-header-meta b { color: var(--pp-text-2); }

.pp-header-stats {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

/* ── Stat pill ─────────────────────────────────────────────── */
.pp-stat-pill {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 14px;
  border-radius: var(--pp-radius-sm);
  background: var(--pp-surface);
  border: 1px solid var(--pp-border);
  transition: border-color var(--pp-fast), transform 160ms var(--pp-ease);
  cursor: pointer;
  text-align: left;
}

@media (hover: hover) and (pointer: fine) {
  .pp-stat-pill:hover { border-color: var(--pp-border-strong); }
}

.pp-stat-pill:active { transform: scale(0.97); }

.pp-stat-pill-icon { color: var(--pp-accent); font-size: 15px; }

.pp-stat-pill-val {
  font-size: 1.0625rem;
  font-weight: 700;
  line-height: 1.1;
  color: var(--pp-text);
  display: block;
}

.pp-stat-pill-lbl {
  font-size: 0.6875rem;
  font-weight: 600;
  color: var(--pp-text-4);
  display: block;
}

/* ── Main layout: rail + content ───────────────────────────── */
.pp-body {
  width: 100%;
  padding: 20px 24px 80px;
  display: flex;
  gap: 24px;
  align-items: flex-start;
}

/* ── Filter rail ───────────────────────────────────────────── */
.pp-rail {
  width: var(--pp-rail-w);
  flex: 0 0 var(--pp-rail-w);
  position: sticky;
  top: 72px;           /* below your site's navbar */
  max-height: calc(100vh - 90px);
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--pp-surface-3) transparent;
}

.pp-rail::-webkit-scrollbar { width: 5px; }
.pp-rail::-webkit-scrollbar-thumb { background: var(--pp-surface-3); border-radius: 99px; }

.pp-rail-inner {
  background: var(--pp-surface);
  border: 1px solid var(--pp-border);
  border-radius: var(--pp-radius);
  padding: 0 0 8px;
}

.pp-rail-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px 12px;
  border-bottom: 1px solid var(--pp-border);
}

.pp-rail-head-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 0.9375rem;
  color: var(--pp-text);
}

.pp-rail-head-title i { color: var(--pp-accent); }

.pp-btn-clear {
  background: none;
  border: none;
  color: var(--pp-accent);
  font-size: 0.8125rem;
  font-weight: 700;
  padding: 0;
  transition: opacity var(--pp-fast);
}

.pp-btn-clear:hover { opacity: .75; }

/* Filter section accordion */
.pp-filter-section {
  border-bottom: 1px solid var(--pp-border);
}

.pp-filter-section:last-child { border-bottom: none; }

.pp-filter-section-btn {
  width: 100%;
  background: none;
  border: none;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  text-align: left;
  transition: background var(--pp-fast), transform 160ms var(--pp-ease);
}

@media (hover: hover) and (pointer: fine) {
  .pp-filter-section-btn:hover { background: var(--pp-surface-2); }
}

.pp-filter-section-btn:active { transform: scale(0.98); }

.pp-filter-section-label {
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: .07em;
  text-transform: uppercase;
  color: var(--pp-text-3);
  flex: 1;
}

.pp-filter-count-badge {
  font-size: 0.6875rem;
  font-weight: 700;
  color: var(--pp-accent);
  background: var(--pp-accent-dim);
  border-radius: 99px;
  padding: 1px 7px;
}

.pp-filter-chevron {
  color: var(--pp-text-4);
  font-size: 0.75rem;
  transition: transform var(--pp-base);
}

.pp-filter-section.is-open .pp-filter-chevron { transform: rotate(180deg); }

.pp-filter-body {
  display: none;
  padding: 2px 12px 12px;
}

.pp-filter-section.is-open .pp-filter-body { display: block; }

/* Subject search within filter */
.pp-subj-search-wrap {
  position: relative;
  margin-bottom: 8px;
}

.pp-subj-search-wrap i {
  position: absolute;
  left: 10px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--pp-text-4);
  font-size: 12px;
  pointer-events: none;
}

.pp-subj-search {
  width: 100%;
  padding: 7px 10px 7px 28px;
  border: 1px solid var(--pp-border);
  border-radius: var(--pp-radius-xs);
  background: var(--pp-surface-2);
  font-size: 0.8125rem;
  color: var(--pp-text);
  outline: none;
  transition: border-color var(--pp-fast);
}

.pp-subj-search:focus { border-color: var(--pp-accent); }

.pp-filter-list {
  display: flex;
  flex-direction: column;
  gap: 1px;
  max-height: 260px;
  overflow-y: auto;
  margin: 0 -4px;
  padding: 0 4px;
  scrollbar-width: thin;
  scrollbar-color: var(--pp-surface-3) transparent;
}

.pp-filter-list::-webkit-scrollbar { width: 4px; }
.pp-filter-list::-webkit-scrollbar-thumb { background: var(--pp-surface-3); border-radius: 99px; }

/* Check row */
.pp-check-row {
  width: 100%;
  background: transparent;
  border: none;
  border-radius: var(--pp-radius-xs);
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 6px 8px;
  text-align: left;
  transition: background var(--pp-fast), transform 160ms var(--pp-ease);
}

@media (hover: hover) and (pointer: fine) {
  .pp-check-row:hover { background: var(--pp-surface-2); }
}

.pp-check-row:active { transform: scale(0.98); }
.pp-check-row.is-checked { background: var(--pp-accent-dim); }

.pp-check-box {
  width: 16px;
  height: 16px;
  flex: 0 0 16px;
  border-radius: 5px;
  border: 1.5px solid var(--pp-border-strong);
  background: transparent;
  display: grid;
  place-items: center;
  transition: background var(--pp-fast), border-color var(--pp-fast);
  color: var(--pp-on-accent);
  font-size: 9px;
}

.pp-check-row.is-checked .pp-check-box {
  background: var(--pp-accent);
  border-color: transparent;
}

.pp-check-label {
  flex: 1;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--pp-text-2);
  line-height: 1.3;
}

.pp-check-row.is-checked .pp-check-label {
  font-weight: 600;
  color: var(--pp-text);
}

.pp-check-sub {
  font-size: 0.6875rem;
  color: var(--pp-text-4);
  display: block;
}

.pp-check-count {
  font-size: 0.6875rem;
  font-weight: 600;
  color: var(--pp-text-4);
  font-variant-numeric: tabular-nums;
}

/* Year pill grid */
.pp-year-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding-top: 2px;
}

.pp-year-pill {
  padding: 6px 12px;
  border-radius: var(--pp-radius-xs);
  font-size: 0.8125rem;
  font-weight: 600;
  border: 1px solid var(--pp-border);
  background: var(--pp-surface-2);
  color: var(--pp-text-3);
  transition: background var(--pp-fast), color var(--pp-fast), border-color var(--pp-fast), transform 160ms var(--pp-ease);
}

.pp-year-pill:active { transform: scale(0.94); }

.pp-year-pill.is-active {
  background: var(--pp-accent);
  border-color: transparent;
  color: var(--pp-on-accent);
}

/* ── Main content area ─────────────────────────────────────── */
.pp-main {
  flex: 1;
  min-width: 0;
}

/* ── Control bar ───────────────────────────────────────────── */
.pp-controls {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 16px;
}

.pp-controls-row {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

/* Search input */
.pp-search-wrap {
  position: relative;
  flex: 1;
  min-width: 220px;
}

.pp-search-wrap svg.pp-search-icon {
  position: absolute;
  left: 13px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--pp-text-4);
  width: 16px;
  height: 16px;
  pointer-events: none;
  flex-shrink: 0;
}

.pp-search-input {
  width: 100%;
  padding: 11px 38px 11px 40px;
  border: 1px solid var(--pp-border);
  border-radius: var(--pp-radius-sm);
  background: var(--pp-surface);
  color: var(--pp-text);
  font-size: 0.90625rem;
  outline: none;
  transition: border-color var(--pp-fast), box-shadow var(--pp-fast);
}

.pp-search-input:focus {
  border-color: var(--pp-accent);
  box-shadow: 0 0 0 3px rgba(232,17,35,.09);
}

.pp-search-clear {
  position: absolute;
  right: 8px;
  top: 50%;
  transform: translateY(-50%);
  width: 22px;
  height: 22px;
  border-radius: 99px;
  background: var(--pp-surface-3);
  border: none;
  color: var(--pp-text-3);
  display: grid;
  place-items: center;
  font-size: 11px;
  transition: background var(--pp-fast);
}

.pp-search-clear:hover { background: var(--pp-border-strong); }

/* Mobile filter toggle */
.pp-mobile-filter-btn {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  border-radius: var(--pp-radius-sm);
  border: 1px solid var(--pp-border);
  background: var(--pp-surface);
  color: var(--pp-text-2);
  font-weight: 600;
  font-size: 0.875rem;
  position: relative;
}

.pp-mobile-filter-btn .pp-filter-badge {
  background: var(--pp-accent);
  color: var(--pp-on-accent);
  border-radius: 99px;
  font-size: 0.6875rem;
  font-weight: 700;
  padding: 0 6px;
}

/* View toggle segmented */
.pp-view-toggle {
  display: flex;
  background: var(--pp-surface);
  border: 1px solid var(--pp-border);
  border-radius: var(--pp-radius-sm);
  padding: 3px;
  gap: 2px;
}

.pp-view-btn {
  width: 34px;
  height: 34px;
  border: none;
  border-radius: 6px;
  background: transparent;
  color: var(--pp-text-4);
  display: grid;
  place-items: center;
  font-size: 14px;
  transition: background var(--pp-fast), color var(--pp-fast);
}

.pp-view-btn.is-active {
  background: var(--pp-surface-3);
  color: var(--pp-text);
}

/* Tabs row */
.pp-tabs {
  display: flex;
  background: var(--pp-surface);
  border: 1px solid var(--pp-border);
  border-radius: var(--pp-radius-sm);
  padding: 3px;
  gap: 2px;
}

.pp-tab {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 7px 12px;
  border-radius: 6px;
  border: none;
  background: transparent;
  color: var(--pp-text-4);
  font-weight: 600;
  font-size: 0.8125rem;
  transition: background var(--pp-fast), color var(--pp-fast), transform 160ms var(--pp-ease);
}

.pp-tab:active { transform: scale(0.96); }

.pp-tab.is-active {
  background: var(--pp-surface-3);
  color: var(--pp-text);
}

.pp-tab-badge {
  font-size: 0.6875rem;
  font-weight: 700;
  padding: 0 6px;
  border-radius: 99px;
  background: var(--pp-surface-3);
  color: var(--pp-text-3);
}

.pp-tab.is-active .pp-tab-badge {
  background: var(--pp-accent);
  color: var(--pp-on-accent);
}

/* Sort select */
.pp-sort-wrap {
  position: relative;
  margin-left: auto;
}

.pp-sort-select {
  appearance: none;
  padding: 7px 28px 7px 12px;
  border-radius: var(--pp-radius-xs);
  border: 1px solid var(--pp-border);
  background: var(--pp-surface);
  color: var(--pp-text);
  font-size: 0.8125rem;
  font-weight: 600;
  outline: none;
  cursor: pointer;
  transition: border-color var(--pp-fast);
}

.pp-sort-select:focus,
.pp-sort-select:hover { border-color: var(--pp-border-strong); }

.pp-sort-wrap::after {
  content: "\f078"; /* fa-chevron-down */
  font-family: "Font Awesome 6 Free";
  font-weight: 900;
  font-size: 10px;
  position: absolute;
  right: 10px;
  top: 50%;
  transform: translateY(-50%);
  pointer-events: none;
  color: var(--pp-text-4);
}

/* Active filter chips */
.pp-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  align-items: center;
}

.pp-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 6px 4px 10px;
  border-radius: 99px;
  background: var(--pp-surface-2);
  border: 1px solid var(--pp-border);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--pp-text-2);
}

.pp-chip-remove {
  width: 16px;
  height: 16px;
  border-radius: 99px;
  background: var(--pp-surface-3);
  border: none;
  color: var(--pp-text-3);
  display: grid;
  place-items: center;
  font-size: 9px;
  transition: background var(--pp-fast);
}

.pp-chip-remove:hover { background: var(--pp-border-strong); }

.pp-chips-clear-all {
  background: none;
  border: none;
  color: var(--pp-accent);
  font-weight: 700;
  font-size: 0.8125rem;
  padding: 4px 6px;
}

/* ── Results count bar ─────────────────────────────────────── */
.pp-results-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
  font-size: 0.8125rem;
  color: var(--pp-text-3);
  font-weight: 600;
}

.pp-results-bar b { color: var(--pp-text-2); }

.pp-collapse-all-btn {
  background: none;
  border: none;
  color: var(--pp-text-3);
  font-weight: 600;
  font-size: 0.8125rem;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: color var(--pp-fast);
}

.pp-collapse-all-btn:hover { color: var(--pp-text-2); }

/* ── Subject groups ─────────────────────────────────────────── */
.pp-groups {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.pp-group {
  background: var(--pp-surface);
  border: 1px solid var(--pp-border);
  border-radius: var(--pp-radius);
  overflow: hidden;
}

.pp-group-toggle {
  width: 100%;
  background: none;
  border: none;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 13px 15px;
  text-align: left;
  transition: background var(--pp-fast), transform 160ms var(--pp-ease);
}

@media (hover: hover) and (pointer: fine) {
  .pp-group-toggle:hover { background: var(--pp-surface-2); }
}

.pp-group-toggle:active { transform: scale(0.99); }

.pp-group-icon {
  width: 36px;
  height: 36px;
  flex: 0 0 36px;
  border-radius: 9px;
  display: grid;
  place-items: center;
  font-size: 0.8125rem;
  font-weight: 700;
}

.pp-group-name {
  flex: 1;
  min-width: 0;
}

.pp-group-title {
  font-size: 0.9375rem;
  font-weight: 600;
  letter-spacing: -.01em;
  color: var(--pp-text);
  display: block;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.pp-group-subtitle {
  font-size: 0.75rem;
  color: var(--pp-text-4);
}

.pp-group-progress {
  position: relative;
  display: grid;
  place-items: center;
  margin-right: 4px;
}

.pp-group-progress-label {
  position: absolute;
  font-size: 9px;
  font-weight: 700;
  color: var(--pp-text-3);
}

.pp-group-chevron {
  color: var(--pp-text-4);
  font-size: 14px;
  transition: transform var(--pp-base);
}

.pp-group.is-open .pp-group-chevron { transform: none; }
.pp-group:not(.is-open) .pp-group-chevron { transform: rotate(-90deg); }

/* Grid trick: animates open/close without knowing height */
.pp-group-body {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 220ms var(--pp-ease);
  border-top: 0px solid var(--pp-border);
  overflow: hidden;
}

.pp-group-body-inner {
  min-height: 0;
  padding: 0 6px;
  opacity: 0;
  transform: translateY(-4px);
  transition: opacity 180ms var(--pp-ease), transform 180ms var(--pp-ease);
}

.pp-group.is-open .pp-group-body {
  grid-template-rows: 1fr;
  border-top-width: 1px;
}

.pp-group.is-open .pp-group-body-inner {
  opacity: 1;
  transform: translateY(0);
  padding: 4px 6px 8px;
}

/* ── Year blocks ────────────────────────────────────────────── */
.pp-year-block { border-radius: 9px; overflow: hidden; margin: 2px 0; }

.pp-year-toggle {
  width: 100%;
  background: none;
  border: none;
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 8px 10px;
  text-align: left;
  transition: background var(--pp-fast), transform 160ms var(--pp-ease);
}

@media (hover: hover) and (pointer: fine) {
  .pp-year-toggle:hover { background: var(--pp-surface-2); }
}

.pp-year-toggle:active { transform: scale(0.99); }

.pp-year-chevron {
  color: var(--pp-text-4);
  font-size: 11px;
  transition: transform var(--pp-base);
}

.pp-year-block.is-open .pp-year-chevron { transform: none; }
.pp-year-block:not(.is-open) .pp-year-chevron { transform: rotate(-90deg); }

.pp-year-label {
  font-size: 0.84375rem;
  font-weight: 700;
  letter-spacing: .01em;
  color: var(--pp-text);
}

.pp-year-count { font-size: 0.75rem; color: var(--pp-text-4); }

.pp-year-done-badge {
  font-size: 0.6875rem;
  font-weight: 700;
  color: var(--pp-success);
  background: var(--pp-success-dim);
  border-radius: 99px;
  padding: 1px 8px;
}

.pp-year-rule {
  flex: 1;
  height: 1px;
  background: var(--pp-border);
  margin-left: 4px;
}

.pp-year-body {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 200ms var(--pp-ease);
  overflow: hidden;
}

.pp-year-body-inner {
  min-height: 0;
  opacity: 0;
  transform: translateY(-3px);
  transition: opacity 160ms var(--pp-ease), transform 160ms var(--pp-ease);
}

.pp-year-block.is-open .pp-year-body { grid-template-rows: 1fr; }

.pp-year-block.is-open .pp-year-body-inner {
  opacity: 1;
  transform: translateY(0);
}

/* ── Paper row (list view) ──────────────────────────────────── */
.pp-papers-list { padding-bottom: 4px; }

.pp-row {
  display: flex;
  align-items: center;
  gap: 13px;
  padding: 11px 10px;
  border-radius: 9px;
  transition: background var(--pp-fast);
  position: relative;
}

@media (hover: hover) and (pointer: fine) {
  .pp-row:hover { background: var(--pp-surface-2); }
}

.pp-row-thumb {
  width: 36px;
  height: 42px;
  flex: 0 0 36px;
  border-radius: 7px;
  display: grid;
  place-items: center;
  position: relative;
}

.pp-row-thumb i { font-size: 17px; }

.pp-row-done-dot {
  position: absolute;
  bottom: -3px;
  right: -3px;
  width: 15px;
  height: 15px;
  border-radius: 99px;
  background: var(--pp-success);
  color: #fff;
  display: grid;
  place-items: center;
  font-size: 8px;
  border: 2px solid var(--pp-surface);
}

.pp-row-main { flex: 1; min-width: 0; }

.pp-row-title-line {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 3px;
}

.pp-row-title {
  font-weight: 600;
  font-size: 0.90625rem;
  letter-spacing: -.005em;
  color: var(--pp-text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.pp-row-badge {
  font-size: 0.6875rem;
  font-weight: 700;
  padding: 1.5px 7px;
  border-radius: 5px;
  letter-spacing: .02em;
  flex-shrink: 0;
}

.pp-row-meta {
  font-size: 0.75rem;
  color: var(--pp-text-4);
  display: flex;
  align-items: center;
  gap: 7px;
  flex-wrap: wrap;
}

.pp-row-meta-sep {
  width: 3px;
  height: 3px;
  border-radius: 99px;
  background: var(--pp-text-4);
  flex-shrink: 0;
}

.pp-row-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

/* ── Icon button ────────────────────────────────────────────── */
.pp-icon-btn {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  border: 1px solid var(--pp-border);
  background: var(--pp-surface);
  color: var(--pp-text-4);
  display: grid;
  place-items: center;
  font-size: 13px;
  transition: border-color var(--pp-fast), color var(--pp-fast), background var(--pp-fast), transform 160ms var(--pp-ease);
  flex-shrink: 0;
}

@media (hover: hover) and (pointer: fine) {
  .pp-icon-btn:hover { border-color: var(--pp-border-strong); color: var(--pp-text-2); }
}

.pp-icon-btn:active { transform: scale(0.88); }

.pp-icon-btn.is-active {
  background: var(--pp-accent-dim);
  border-color: transparent;
  color: var(--pp-accent);
}

/* ── Status toggle ──────────────────────────────────────────── */
.pp-status-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: 1px solid var(--pp-border);
  background: transparent;
  border-radius: 99px;
  padding: 4px 10px 4px 8px;
  font-size: 0.78125rem;
  font-weight: 600;
  color: var(--pp-text-4);
  transition: border-color var(--pp-fast), color var(--pp-fast), background var(--pp-fast), transform 160ms var(--pp-ease);
}

.pp-status-btn:active { transform: scale(0.94); }

.pp-status-btn[data-status="reviewing"] {
  color: var(--pp-accent);
  background: var(--pp-accent-dim);
  border-color: transparent;
}

.pp-status-btn[data-status="done"] {
  color: var(--pp-success);
  background: var(--pp-success-dim);
  border-color: transparent;
}

/* ── Download buttons ───────────────────────────────────────── */
.pp-dl-group { display: flex; gap: 7px; flex-shrink: 0; }

.pp-btn-paper {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 12px;
  border-radius: 8px;
  border: none;
  background: var(--pp-accent);
  color: var(--pp-on-accent);
  font-weight: 700;
  font-size: 0.8125rem;
  text-decoration: none;
  transition: background var(--pp-fast), transform 160ms var(--pp-ease);
}

@media (hover: hover) and (pointer: fine) {
  .pp-btn-paper:hover { background: var(--pp-accent-2); }
}

.pp-btn-paper:active { transform: scale(0.96); }

.pp-btn-ms {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 12px;
  border-radius: 8px;
  border: 1px solid var(--pp-border-strong);
  background: var(--pp-surface-2);
  color: var(--pp-text-2);
  font-weight: 600;
  font-size: 0.8125rem;
  text-decoration: none;
  transition: background var(--pp-fast), border-color var(--pp-fast), transform 160ms var(--pp-ease);
}

@media (hover: hover) and (pointer: fine) {
  .pp-btn-ms:hover { background: var(--pp-surface-3); border-color: var(--pp-border-strong); }
}

.pp-btn-ms:active { transform: scale(0.96); }

.pp-btn-ms.is-unavailable {
  opacity: .45;
  cursor: not-allowed;
  pointer-events: none;
}

.pp-btn-er {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 7px 10px;
  border-radius: 8px;
  border: 1px solid var(--pp-border);
  background: var(--pp-surface);
  color: var(--pp-text-3);
  font-size: 0.8125rem;
  font-weight: 600;
  text-decoration: none;
  transition: background var(--pp-fast), transform 160ms var(--pp-ease);
}

@media (hover: hover) and (pointer: fine) {
  .pp-btn-er:hover { background: var(--pp-surface-2); }
}

.pp-btn-er:active { transform: scale(0.96); }

.pp-btn-insert {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 7px 10px;
  border-radius: 8px;
  border: 1px solid var(--pp-border);
  background: var(--pp-surface);
  color: var(--pp-text-3);
  font-size: 0.8125rem;
  font-weight: 600;
  text-decoration: none;
  transition: background var(--pp-fast), transform 160ms var(--pp-ease);
}

@media (hover: hover) and (pointer: fine) {
  .pp-btn-insert:hover { background: var(--pp-surface-2); }
}

.pp-btn-insert:active { transform: scale(0.96); }

.pp-btn-sol {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 7px 10px;
  border-radius: 8px;
  border: 1px solid var(--pp-success-dim);
  background: var(--pp-success-dim);
  color: var(--pp-success);
  font-size: 0.8125rem;
  font-weight: 600;
  text-decoration: none;
  transition: background var(--pp-fast), border-color var(--pp-fast), transform 160ms var(--pp-ease);
}

@media (hover: hover) and (pointer: fine) {
  .pp-btn-sol:hover { background: rgba(16,185,129,.22); border-color: rgba(16,185,129,.35); }
}

.pp-btn-sol:active { transform: scale(0.96); }

/* ── Grid card (grid view) ──────────────────────────────────── */
.pp-papers-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(224px, 1fr));
  gap: 12px;
  padding: 6px 2px 10px;
}

.pp-card {
  background: var(--pp-surface);
  border: 1px solid var(--pp-border);
  border-radius: var(--pp-radius);
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 11px;
  transition: border-color var(--pp-fast), box-shadow var(--pp-fast);
}

.pp-card:hover {
  border-color: var(--pp-border-strong);
  box-shadow: var(--pp-shadow-sm);
}

.pp-card-header { display: flex; justify-content: space-between; align-items: flex-start; }

.pp-card-thumb {
  width: 36px;
  height: 42px;
  border-radius: 7px;
  display: grid;
  place-items: center;
}

.pp-card-thumb i { font-size: 17px; }

.pp-card-title {
  font-weight: 600;
  font-size: 0.90625rem;
  letter-spacing: -.005em;
  color: var(--pp-text);
  line-height: 1.25;
}

.pp-card-subtitle { font-size: 0.78125rem; color: var(--pp-text-4); margin-top: 3px; }

.pp-card-tags { display: flex; gap: 5px; flex-wrap: wrap; }

.pp-tag {
  font-size: 0.6875rem;
  font-weight: 600;
  color: var(--pp-text-3);
  background: var(--pp-surface-2);
  border: 1px solid var(--pp-border);
  border-radius: 5px;
  padding: 2px 7px;
}

.pp-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-top: auto;
}

/* ── Progress ring SVG ──────────────────────────────────────── */
.pp-ring { transform: rotate(-90deg); flex-shrink: 0; }
.pp-ring-track { fill: none; stroke: var(--pp-surface-3); }
.pp-ring-fill {
  fill: none;
  stroke-linecap: round;
  transition: stroke-dashoffset 500ms var(--pp-ease);
}

/* ── Subject browse grid (discover mode) ───────────────────── */
.pp-discover { }

.pp-section-head {
  display: flex;
  align-items: center;
  gap: 9px;
  margin: 0 0 14px;
  font-size: 1.125rem;
  font-weight: 600;
  letter-spacing: -.01em;
  color: var(--pp-text);
}

.pp-section-head i { color: var(--pp-accent); font-size: 16px; }

.pp-section-hint {
  font-size: 0.8125rem;
  color: var(--pp-text-4);
  margin: 4px 0 0 26px;
}

/* Featured horizontal scroll strip */
.pp-featured-strip {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(240px, 1fr);
  gap: 11px;
  overflow-x: auto;
  padding-bottom: 6px;
  scroll-snap-type: x proximity;
  scrollbar-width: none;
  margin-bottom: 28px;
}

.pp-featured-strip::-webkit-scrollbar { display: none; }

.pp-featured-card {
  scroll-snap-align: start;
  background: var(--pp-surface);
  border: 1px solid var(--pp-border);
  border-radius: var(--pp-radius);
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: border-color var(--pp-fast);
}

.pp-featured-card:hover { border-color: var(--pp-border-strong); }

/* ── Recently Viewed carousel ───────────────────────────────── */
.pp-recent-section {
  margin-bottom: 32px;
}

.pp-recent-track-wrap {
  overflow-x: auto;
  scrollbar-width: none;
  padding-bottom: 6px;
  /* subtle right fade hint that more cards exist */
  -webkit-mask-image: linear-gradient(to right, black 85%, transparent 100%);
  mask-image: linear-gradient(to right, black 85%, transparent 100%);
}

.pp-recent-track-wrap::-webkit-scrollbar { display: none; }

.pp-recent-track {
  display: flex;
  gap: 12px;
  width: max-content;
  scroll-snap-type: x mandatory;
  padding: 2px 2px 4px; /* room for box-shadow */
}

.pp-recent-card {
  scroll-snap-align: start;
  flex-shrink: 0;
  width: 200px;
  background: var(--pp-surface);
  border: 1px solid var(--pp-border);
  border-radius: var(--pp-radius);
  padding: 14px 14px 12px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: border-color var(--pp-fast), box-shadow var(--pp-fast);
}

@media (hover: hover) and (pointer: fine) {
  .pp-recent-card:hover {
    border-color: var(--pp-border-strong);
    box-shadow: var(--pp-shadow-sm);
  }
}

.pp-recent-card-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
}

.pp-recent-thumb {
  width: 38px;
  height: 38px;
  border-radius: var(--pp-radius-xs);
  display: grid;
  place-items: center;
  font-size: 18px;
  flex-shrink: 0;
}

.pp-recent-card-body {
  flex: 1;
  min-height: 0;
}

.pp-recent-subj {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--pp-text);
  line-height: 1.3;
  margin-bottom: 3px;
  /* truncate long subject names */
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.pp-recent-meta {
  font-size: 0.75rem;
  color: var(--pp-text-4);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.pp-recent-open {
  width: 100%;
  justify-content: center;
}

/* Subject browse cards */
.pp-subj-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 12px;
}

.pp-level-section {
  margin-bottom: 28px;
}
.pp-level-section:last-child {
  margin-bottom: 0;
}
.pp-level-heading {
  font-size: var(--font-size-sm, 0.875rem);
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin: 0 0 10px;
}

.pp-subj-card {
  text-align: left;
  background: var(--pp-surface);
  border: 1px solid var(--pp-border);
  border-radius: var(--pp-radius);
  padding: 15px;
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 12px;
  transition: transform 160ms var(--pp-ease), border-color var(--pp-fast), background var(--pp-fast);
}

@media (hover: hover) and (pointer: fine) {
  .pp-subj-card:hover {
    transform: translateY(-2px);
    border-color: var(--pp-border-strong);
    background: var(--pp-surface-2);
  }
}

.pp-subj-card:active { transform: scale(0.97); }

/* Unwrapped: icon + badge become direct flex items of .pp-subj-card, reordered below */
.pp-subj-card-top {
  display: contents;
}

.pp-subj-icon {
  order: 1;
  width: 34px;
  height: 34px;
  border-radius: 9px;
  display: grid;
  place-items: center;
  font-size: 0.875rem;
  flex-shrink: 0;
}

/* Text block (name + meta) — always the second/last child of .pp-subj-card */
.pp-subj-card-top ~ div {
  order: 2;
  flex: 1;
  min-width: 0;
}

.pp-subj-code-badge {
  order: 3;
  flex-shrink: 0;
  font-size: 0.6875rem;
  font-weight: 700;
  padding: 3px 7px;
  border-radius: 6px;
  letter-spacing: .02em;
}

.pp-subj-card-name {
  font-weight: 600;
  font-size: 1rem;
  letter-spacing: -.01em;
  line-height: 1.2;
  color: var(--pp-text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.pp-subj-card-meta {
  font-size: 0.78125rem;
  color: var(--pp-text-4);
  margin-top: 2px;
  display: flex;
  align-items: center;
  gap: 7px;
}

.pp-subj-meta-dot {
  width: 3px;
  height: 3px;
  border-radius: 99px;
  background: var(--pp-text-4);
}

/* ── Empty state ────────────────────────────────────────────── */
.pp-empty {
  text-align: center;
  padding: 64px 24px;
  border: 1px dashed var(--pp-border-strong);
  border-radius: var(--pp-radius);
}

.pp-empty-icon-wrap {
  width: 58px;
  height: 58px;
  border-radius: 16px;
  background: var(--pp-surface-2);
  display: grid;
  place-items: center;
  margin: 0 auto 16px;
  color: var(--pp-text-4);
  font-size: 1.5rem;
}

.pp-empty-title {
  font-size: 1.1875rem;
  font-weight: 600;
  color: var(--pp-text);
  margin: 0 0 8px;
}

.pp-empty-text {
  color: var(--pp-text-3);
  font-size: 0.875rem;
  max-width: 360px;
  margin: 0 auto 18px;
  line-height: 1.5;
}

.pp-empty-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: 9px;
  border: none;
  background: var(--pp-accent);
  color: var(--pp-on-accent);
  font-weight: 700;
  font-size: 0.875rem;
  transition: background var(--pp-fast);
}

.pp-empty-btn:hover { background: var(--pp-accent-2); }

/* ── Filter-first prompt ────────────────────────────────────── */
.pp-filter-prompt {
  display: flex;
  align-items: center;
  gap: 28px;
  padding: 48px 32px;
  border: 1px dashed var(--pp-border-strong);
  border-radius: var(--pp-radius);
  background: var(--pp-surface);
}

.pp-filter-prompt-arrow {
  font-size: 1.75rem;
  color: var(--pp-accent);
  animation: ppArrowPulse 1.6s ease-in-out infinite;
  flex-shrink: 0;
}

@keyframes ppArrowPulse {
  0%, 100% { transform: translateX(0); opacity: 1; }
  50%       { transform: translateX(-6px); opacity: .5; }
}

.pp-filter-prompt-icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  background: var(--pp-accent-dim);
  color: var(--pp-accent);
  display: grid;
  place-items: center;
  font-size: 1.375rem;
  margin-bottom: 14px;
}

.pp-filter-prompt h3 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--pp-text);
  margin: 0 0 8px;
}

.pp-filter-prompt p {
  color: var(--pp-text-3);
  font-size: 0.875rem;
  line-height: 1.55;
  margin: 0 0 14px;
  max-width: 380px;
}

.pp-filter-prompt-count {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--pp-text-3);
  background: var(--pp-surface-2);
  border: 1px solid var(--pp-border);
  border-radius: 99px;
  padding: 4px 12px;
}

/* ── Skeleton loaders ───────────────────────────────────────── */
@keyframes ppShimmer {
  from { background-position: -600px 0; }
  to   { background-position:  600px 0; }
}

.pp-skeleton {
  background: linear-gradient(90deg, var(--pp-surface-2) 25%, var(--pp-surface-3) 50%, var(--pp-surface-2) 75%);
  background-size: 600px 100%;
  animation: ppShimmer 1.5s infinite;
  border-radius: 6px;
}

.pp-skeleton-row {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px;
  border-radius: 9px;
  background: var(--pp-surface);
}

.pp-skel-thumb { width: 36px; height: 42px; flex-shrink: 0; border-radius: 7px; }
.pp-skel-line-short { height: 12px; width: 40%; }
.pp-skel-line-long  { height: 14px; width: 60%; }
.pp-skel-line-xs    { height: 10px; width: 30%; }

/* ── Diagram image load states (Test Builder + Topical Questions) ───── */
:root {
  --tqp-diagram-ratio: 4 / 3; /* pragmatic default — no per-image dimension
                                  data exists in the question model */
}

.tqp-q-diagram { position: relative; }

/* Loading = default state (no class needed), so hand-authored diagrams
   embedded directly in question text also get the skeleton for free. */
.tqp-q-diagram:not(.tqp-diagram-loaded):not(.tqp-diagram-error) {
  display: block;
  width: 100%;
  max-width: 85%;
  aspect-ratio: var(--tqp-diagram-ratio);
  margin-left: auto;
  margin-right: auto;
  overflow: hidden;
  border-radius: var(--pp-radius-sm);
  background: linear-gradient(90deg, var(--pp-surface-2) 25%, var(--pp-surface-3) 50%, var(--pp-surface-2) 75%);
  background-size: 600px 100%;
  animation: ppShimmer 1.5s infinite;
}

.tqp-q-diagram:not(.tqp-diagram-loaded):not(.tqp-diagram-error) img {
  opacity: 0;
}

.tqp-q-diagram img {
  transition: opacity 220ms var(--pp-ease);
}

.tqp-q-diagram.tqp-diagram-loaded img {
  opacity: 1;
}

.tqp-q-diagram.tqp-diagram-error {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  max-width: 85%;
  aspect-ratio: var(--tqp-diagram-ratio);
  margin-left: auto;
  margin-right: auto;
  padding: 16px;
  text-align: center;
  border: 1px dashed var(--pp-border);
  border-radius: var(--pp-radius-sm);
  background: var(--pp-surface-2);
}

.tqp-q-diagram.tqp-diagram-error img,
.tqp-q-diagram.tqp-diagram-error picture {
  display: none !important;
}

.tqp-diagram-error-icon { font-size: 1.375rem; color: var(--pp-accent); }
.tqp-diagram-error-text { margin: 0; font-size: 0.8125rem; color: var(--pp-text-3); }

.tqp-diagram-retry-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font: inherit;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--pp-accent);
  background: var(--pp-accent-dim);
  border: 1px solid var(--pp-accent);
  border-radius: var(--pp-radius-xs);
  padding: 5px 12px;
  cursor: pointer;
}

.tqp-diagram-retry-btn:hover {
  background: var(--pp-accent);
  color: var(--pp-on-accent);
}

@media (prefers-reduced-motion: reduce) {
  .tqp-q-diagram:not(.tqp-diagram-loaded):not(.tqp-diagram-error) {
    animation: none;
    background: var(--pp-surface-2);
  }
  .tqp-q-diagram img {
    transition: none;
  }
}

/* Print safety net: never let an unresolved skeleton reach paper/PDF, even if
   window.print() fires before JS/load events have fully settled. */
@media print {
  .tqp-q-diagram:not(.tqp-diagram-loaded):not(.tqp-diagram-error) {
    animation: none !important;
    background: none !important;
    aspect-ratio: auto !important;
    width: auto !important;
  }
  .tqp-q-diagram:not(.tqp-diagram-loaded):not(.tqp-diagram-error) img {
    opacity: 1 !important;
    transition: none !important;
  }
  .tqp-diagram-retry-btn {
    display: none !important;
  }
}

/* ── Mobile filter drawer ───────────────────────────────────── */
.pp-drawer-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 100000;
  background: rgba(0,0,0,.5);
  animation: ppFadeIn 200ms var(--pp-ease) both;
}

.pp-drawer-backdrop.is-open { display: block; }

@keyframes ppFadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

.pp-drawer {
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: min(340px, 88vw);
  background: var(--pp-bg);
  border-right: 1px solid var(--pp-border);
  border-radius: 0 16px 16px 0;
  padding: 16px 16px 40px;
  overflow-y: auto;
  /* iOS-like drawer curve: fast start, soft settle */
  animation: ppSlideIn 280ms var(--pp-ease-drawer) both;
}

@keyframes ppSlideIn {
  from { transform: translateX(-100%); }
  to   { transform: translateX(0); }
}

.pp-drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 6px;
}

.pp-drawer-header-title {
  font-weight: 700;
  font-size: 1.0625rem;
}

.pp-drawer-close {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: var(--pp-surface-2);
  border: none;
  color: var(--pp-text-2);
  display: grid;
  place-items: center;
  font-size: 14px;
}

.pp-drawer-apply {
  width: 100%;
  margin-top: 14px;
  padding: 13px;
  border-radius: 10px;
  border: none;
  background: var(--pp-accent);
  color: var(--pp-on-accent);
  font-weight: 700;
  font-size: 0.9375rem;
  transition: background var(--pp-fast), transform 160ms var(--pp-ease);
}

@media (hover: hover) and (pointer: fine) {
  .pp-drawer-apply:hover { background: var(--pp-accent-2); }
}

.pp-drawer-apply:active { transform: scale(0.97); }

/* ── Responsive breakpoints ─────────────────────────────────── */
@media (max-width: 960px) {
  .pp-rail { display: none; }
  .pp-mobile-filter-btn { display: inline-flex; }
}

@media (max-width: 640px) {
  .pp-body { padding: 14px 14px 60px; }
  .pp-header { padding: 16px 14px 14px; }
  .pp-header-title { font-size: 1.375rem; }
  .pp-row-actions .pp-status-btn { display: none; }
  .pp-header-stats { display: none; }
  .pp-dl-group .pp-btn-er { display: none; }

  /* Row: wrap so actions drop below title on small screens */
  .pp-row { flex-wrap: wrap; align-items: flex-start; row-gap: 8px; }
  .pp-row-thumb { margin-top: 2px; }
  .pp-row-main { flex: 1 1 0; min-width: 0; }
  .pp-row-actions {
    flex: 0 0 100%;
    /* indent to align with text (thumb width + gap) */
    padding-left: calc(36px + 13px);
  }

  /* Shrink "Mark Scheme" → "MS" to save space */
  .pp-row-actions .pp-btn-ms { font-size: 0; }
  .pp-row-actions .pp-btn-ms svg { font-size: 14px; width: 14px; height: 14px; }
  .pp-row-actions .pp-btn-ms::after { content: "MS"; font-size: 13px; }
}

@media (max-width: 480px) {
  .pp-papers-grid { grid-template-columns: 1fr; }
}

/* ── Utility ────────────────────────────────────────────────── */
.pp-hidden { display: none !important; }

.pp-animate-in {
  animation: ppFadeUp 220ms var(--pp-ease) both;
}

@keyframes ppFadeUp {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* Staggered entry for subject groups in results */
.pp-groups .pp-group {
  animation: ppFadeUp 220ms var(--pp-ease) both;
}

.pp-groups .pp-group:nth-child(1)  { animation-delay:  0ms; }
.pp-groups .pp-group:nth-child(2)  { animation-delay: 35ms; }
.pp-groups .pp-group:nth-child(3)  { animation-delay: 70ms; }
.pp-groups .pp-group:nth-child(4)  { animation-delay: 105ms; }
.pp-groups .pp-group:nth-child(5)  { animation-delay: 140ms; }
.pp-groups .pp-group:nth-child(n+6){ animation-delay: 175ms; }

/* Staggered entry for subject browse cards */
.pp-subj-grid .pp-subj-card {
  animation: ppFadeUp 220ms var(--pp-ease) both;
}

.pp-subj-grid .pp-subj-card:nth-child(1)  { animation-delay:  0ms; }
.pp-subj-grid .pp-subj-card:nth-child(2)  { animation-delay: 25ms; }
.pp-subj-grid .pp-subj-card:nth-child(3)  { animation-delay: 50ms; }
.pp-subj-grid .pp-subj-card:nth-child(4)  { animation-delay: 75ms; }
.pp-subj-grid .pp-subj-card:nth-child(5)  { animation-delay: 100ms; }
.pp-subj-grid .pp-subj-card:nth-child(6)  { animation-delay: 125ms; }
.pp-subj-grid .pp-subj-card:nth-child(7)  { animation-delay: 150ms; }
.pp-subj-grid .pp-subj-card:nth-child(8)  { animation-delay: 175ms; }
.pp-subj-grid .pp-subj-card:nth-child(n+9){ animation-delay: 200ms; }

@media (prefers-reduced-motion: reduce) {
  /* Kill motion; keep colour/opacity transitions that aid comprehension */
  .pp-root * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
  .pp-root *,
  .pp-root *::before,
  .pp-root *::after {
    transition-property: background-color, border-color, color, opacity !important;
    transition-duration: 100ms !important;
  }
}